I added in the document "example.identities.sql" user and group and uploaded this document in the database using the command "ant -Ddatabase=mysql load.example.identities". When I try to log into the user interface using the username "as" and password "pass" I get the following message:

I don't know this error message but I remember that to be able to login to the webconsole all created users have to be part of the group "user" since this is a security-role and gives you te permission to use the web-application/console. So try adding a membership for "as" in user.